feat: add download multi tracks support for mobile platform

.fvm/fvm_config.json

@@ -0,0 +1,4 @@
+{
+  "flutterSdkVersion": "3.0.5",
+  "flavors": {}
+}

.gitignore

@@ -75,3 +75,4 @@ dist
 appimage-build
 
 android/key.properties
+.fvm/flutter_sdk

android/app/build.gradle

@@ -50,7 +50,7 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "oss.krtirtho.spotube"
-        minSdkVersion flutter.minSdkVersion
+        minSdkVersion 19
         targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName

android/app/src/main/AndroidManifest.xml

@@ -28,6 +28,10 @@
 
     </activity>
 
+    <provider android:name="vn.hunghd.flutterdownloader.DownloadedFileProvider" android:authorities="${applicationId}.flutter_downloader.provider" android:exported="false" android:grantUriPermissions="true">
+      <meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/provider_paths" />
+    </provider>
+
     <service android:name="com.ryanheise.audioservice.AudioService" android:exported="false">
       <intent-filter>
         <action android:name="android.media.browse.MediaBrowserService" />

lib/main.dart

@@ -2,7 +2,9 @@ import 'dart:convert';
 
 import 'package:audio_service/audio_service.dart';
 import 'package:bitsdojo_window/bitsdojo_window.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_downloader/flutter_downloader.dart';
 import 'package:flutter_hooks/flutter_hooks.dart';
 import 'package:go_router/go_router.dart';
 import 'package:hive_flutter/hive_flutter.dart';
@@ -26,8 +28,8 @@ void main() async {
   Hive.registerAdapter(CacheTrackAdapter());
   Hive.registerAdapter(CacheTrackEngagementAdapter());
   Hive.registerAdapter(CacheTrackSkipSegmentAdapter());
-  if (kIsDesktop) {
   WidgetsFlutterBinding.ensureInitialized();
+  if (kIsDesktop) {
     doWhenWindowReady(() async {
       final localStorage = await SharedPreferences.getInstance();
       final rawSize = localStorage.getString(LocalStorageKeys.windowSizeInfo);
@@ -44,6 +46,11 @@ void main() async {
       }
       appWindow.show();
     });
+  } else {
+    await FlutterDownloader.initialize(
+      debug: kDebugMode,
+      ignoreSsl: true,
+    );
   }
   MobileAudioService? audioServiceHandler;
   runApp(ProviderScope(
@@ -102,8 +109,13 @@ class _SpotubeState extends ConsumerState<Spotube> with WidgetsBindingObserver {
     super.initState();
     SharedPreferences.getInstance().then(((value) => localStorage = value));
     WidgetsBinding.instance.addObserver(this);
+    FlutterDownloader.registerCallback(downloadCallback);
   }
 
+  @pragma('vm:entry-point')
+  static void downloadCallback(
+      String id, DownloadTaskStatus status, int progress) {}
+
   @override
   void dispose() {
     WidgetsBinding.instance.removeObserver(this);

lib/provider/Downloader.dart

@@ -2,12 +2,14 @@ import 'dart:async';
 import 'dart:io';
 
 import 'package:flutter/widgets.dart';
+import 'package:flutter_downloader/flutter_downloader.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:queue/queue.dart';
 import 'package:path/path.dart' as path;
 import 'package:spotube/models/SpotubeTrack.dart';
 import 'package:spotube/provider/UserPreferences.dart';
 import 'package:spotube/provider/YouTube.dart';
+import 'package:spotube/utils/platform.dart';
 import 'package:youtube_explode_dart/youtube_explode_dart.dart';
 
 Queue _queueInstance = Queue(delay: const Duration(seconds: 5));
@@ -27,15 +29,30 @@ class Downloader with ChangeNotifier {
   int currentlyRunning = 0;
   Set<String> inQueue = {};
 
-  void addToQueue(SpotubeTrack track) {
-    if (inQueue.contains(track.id!)) return;
+  void addToQueue(SpotubeTrack track) async {
     currentlyRunning++;
     inQueue.add(track.id!);
     notifyListeners();
+    final filename = '${track.ytTrack.title}.mp3';
+    if (kIsMobile) {
+      final url =
+          ((await yt.videos.streamsClient.getManifest(track.ytTrack.url)))
+              .audioOnly
+              .where((audio) => audio.codec.mimeType == "audio/mp4")
+              .withHighestBitrate()
+              .url;
+      await FlutterDownloader.enqueue(
+        savedDir: downloadPath,
+        url: url.toString(),
+        fileName: filename,
+        openFileFromNotification: true,
+        showNotification: true,
+      );
+    } else {
+      if (inQueue.contains(track.id!)) return;
       _queue.add(() async {
         try {
-        final file =
-            File(path.join(downloadPath, '${track.ytTrack.title}.mp3'));
+          final file = File(path.join(downloadPath, filename));
           if (file.existsSync() && await onFileExists?.call(track) != true) {
             return;
           }
@@ -60,13 +77,18 @@ class Downloader with ChangeNotifier {
         }
       });
     }
+  }
 
-  cancel() {
+  cancelAll() {
+    if (kIsMobile) {
+      FlutterDownloader.cancelAll();
+    } else {
       _queue.cancel();
       _queueInstance = Queue();
       _queue = _queueInstance;
     }
   }
+}
 
 final downloaderProvider = ChangeNotifierProvider(
   (ref) {